MacIntoshes

[Keith Mastin]

<snip>
> But I don't have a static IP, and we're talking Sympatico here... ;-)
> It's against my TOS to even run a mail server (of course, I can run a
> P2P server and upload GB's of pr0n, *that's* no problem...).

Sympatico will not remap your reverse dns as it's all dynamic. They would
be my 2nd-to-last choice for an ISP for browsing the web, let alone trying
to run public servers of any type.

<snip>
> On my end, Postfix is configured to send mail *only* for "host":
>
> mynetworks_style = host
>
> but I could configure it like so:
>
> #mynetworks_style = subnet
>
> so no one outside my router would be able to use it as a relay, right?

Generally, yeah. There's more to it than that, but it's a good start.

>> In a way what you say is correct... you do want your mailserver to
>> resolve with an MX RR that resolves to an A RR, but the hostname
>> doesn't have to be mail, smtp or pop. We just use those to keep track
>> of where our systems are and what they do. :)
>
> Like I say, I'm currently on a dynamic IP, so I'm not even sure that's
> possible. I use Zoneedit.com, which has a field where I can enter a
> mailserver name...is that an MX record?

Yes, or at least, it should be. You would have to ask the folks at
zoneedit about that to be sure. Be careful when messing with dns, you
could literally break something, so it's really valuable to learn.

Those are in the dns resource records for the domain. For bind9, the
entries should be something like
                      MX   mailhost.domain.tld
...
mailhost.domain.tld   A    123.123.123.123
...but if you're not doing your own dns, this is not for you to worry about.

> Sheesh, just when I think I've got a grasp on things, I realize how much
> I have yet to learn...:-P

Oh, that never ends. Just as soon as you have a grasp on a concept, they
go and change the program. :)

-- 
Keith Mastin
BeechTree Information Technology Services Inc.
Toronto, Canada
(416)696 6070


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